C# Discussion Boards - CodeProject

Re: Form error massage. Has anyone seen it!

gwithey14-Jul-09 23:30

gwithey

14-Jul-09 23:30

Apparently the answer is to close down the project and open it again and it works fine.

Vs just wanted to be awkward.

Re: Form error massage. Has anyone seen it!

Tom Deketelaere15-Jul-09 1:52

Tom Deketelaere

15-Jul-09 1:52

Sometimes rebuilding helps as well with these weird errors.

I get them a lot when using usercontrols.

Re: Form error massage. Has anyone seen it!

gwithey15-Jul-09 2:06

gwithey

15-Jul-09 2:06

Yeah that did work although there is another error:
Warning 1 Object reference not set to an instance of an object.

which appears every now and again and prevents me seeing the form in design view.

Re: Form error massage. Has anyone seen it!

Tom Deketelaere15-Jul-09 2:35

Tom Deketelaere

15-Jul-09 2:35

You don't happen to be using vs2005
I noticed I have it there more than in vs2008 (can't remember having it in 2008 ever actually)

When rebuilding the project its best to have the designer and maybe even the code closed.
Don't know why it happens, all I can think off is that it's a bug.

Re: Form error massage. Has anyone seen it!

gwithey15-Jul-09 2:38

gwithey

15-Jul-09 2:38

Yes it is strange.

will have to try that
Hopefully its a bug with vs and not my code.

Thanx for the help

Re: Form error massage. Has anyone seen it!

V.15-Jul-09 1:02

15-Jul-09 1:02

is it an error or a warning?
Generally I see those as a warning when I did something like:

int my_int;

instead of

int my_int = 0;

it warns you in order to avoid being null when running a statement later.

hope this helps.

V.

Stop smoking so you can: Enjoy longer the money you save.
Moviereview Archive

skipping access denied folders when using GetDirectories()

lane0p214-Jul-09 22:46

lane0p2

14-Jul-09 22:46

Hi all,

i can use something like the code below to get all the directory within a given folder.

DirectoryInfo di = new DirectoryInfo(@"C:\");
foreach (DirectoryInfo d in di.GetDirectories("*.*", SearchOption.AllDirectories))
{
Console.WriteLine(d.Name);
}

but as soon as i hit a folder i dont have access to it crashes.
is there anyway i can perform the same action but get it to skip folder i don't have access too?

Many Thanks,

Phil

Re: skipping access denied folders when using GetDirectories()

benjymous14-Jul-09 23:04

benjymous

14-Jul-09 23:04

use a try/catch?

Help me! I'm turning into a grapefruit!
Buzzwords!

Re: skipping access denied folders when using GetDirectories()

Luc Pattyn15-Jul-09 0:30

Luc Pattyn

15-Jul-09 0:30

use try-catch inside the loop. That is what I do.

BTW: .NET 4.0 will offer better methods to enumerate files/folders, without requiring a (possibly huge) array, so one will be able to really use the recursive mode.

Smile | :)

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Re: skipping access denied folders when using GetDirectories()

dan!sh 15-Jul-09 0:39

dan!sh

15-Jul-09 0:39

That will not work. The exception will occur while executing the GetDirectories method itself and control will never go inside the try/catch.

Re: skipping access denied folders when using GetDirectories()

Luc Pattyn15-Jul-09 0:44

Luc Pattyn

15-Jul-09 0:44

It works for me, I am listing all files/folders of any device I choose (both XP and Vista).
If GetDirectories() and GetFiles() would not cope with inaccessible files and folders, they would be completely useless, wouldn't they?

Smile | :)

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Re: skipping access denied folders when using GetDirectories()

dan!sh 15-Jul-09 0:53

dan!sh

15-Jul-09 0:53

In XP SP2, I created a folder(c:\TestFolder) and "denied" all the permissions under security tab. GetDirectories method itself will throw exception. Control never came to try/catch. See my code:

DirectoryInfo dirInfo = new DirectoryInfo(@"C:\");
foreach (DirectoryInfo dir in dirInfo.GetDirectories("*.*", SearchOption.AllDirectories)) {
  try {
  }
  catch {
  }
}

Re: skipping access denied folders when using GetDirectories()

Luc Pattyn15-Jul-09 1:02

Luc Pattyn

15-Jul-09 1:02

That is new to me. I'll have to investigate.
And what is your solution?

Smile | :)

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Re: skipping access denied folders when using GetDirectories()

dan!sh 15-Jul-09 1:33

dan!sh

15-Jul-09 1:33

Never faced this issue, so far. If I do, I would go for Linq. May be something along the lines of this[^] approach.

If it .Net 2.0, Linq bridge[^] might save me.

Re: skipping access denied folders when using GetDirectories()

dan!sh 15-Jul-09 0:36

dan!sh

15-Jul-09 0:36

AFAIK there is no such option present. You will have to write your own method to do this.

Re: skipping access denied folders when using GetDirectories()

lane0p215-Jul-09 10:47

lane0p2

15-Jul-09 10:47

Cool, thanks guy, i thought there would be an easy option!!

Beep() does not work

gehbitte14-Jul-09 22:44

gehbitte

14-Jul-09 22:44

I implemented some sort of Beep functionality to my Application, but I don't hear a sound:

[DllImport("kernel32.dll")]
        public static extern bool Beep(int Frequenz, int Dauer);

        
        public static void Alarm()
        {
            for (int i = 0; i < 3; i++)
            {
                Beep(500, 1000);
                Beep(1000, 1000);
            }
        }

        
        public static void Beep()
        {
            Beep(1000, 1000);           
        }

On my testform I click a Button to test this:

private void button6_Click(object sender, EventArgs e)
        {
            //Program.testwindow();
            Program.Alarm();
        }

PC Speaker is ok, it beeps at startup. I am using Vista 64bit. Any suggestions?

Re: Beep() does not work

Nagy Vilmos14-Jul-09 23:11

Nagy Vilmos

14-Jul-09 23:11

Try adding a reference to the Microsoft.VisualBasic assembly and then, as if by magic, you can call:

Microsoft.VisualBasic.Interaction.Beep();

Can you tell what it is yet?

Panic, Chaos, Destruction.
My work here is done.

Re: Beep() does not work

DaveyM6914-Jul-09 23:22

DaveyM69

14-Jul-09 23:22

No need for the VB assembly, it's already there in System.Console class.

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
Why are you using VB6? Do you hate yourself? (Christian Graus)

Re: Beep() does not work

Nagy Vilmos14-Jul-09 23:28

Nagy Vilmos

14-Jul-09 23:28

Serves me right for relying on MSDN for information Blush | :O

Panic, Chaos, Destruction.
My work here is done.

Re: Beep() does not work

Luc Pattyn15-Jul-09 0:32

Luc Pattyn

15-Jul-09 0:32

Needing VB to make C# beep a little would be completely unacceptable. Unsure | :~

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Re: Beep() does not work

DaveyM6914-Jul-09 23:21

DaveyM69

14-Jul-09 23:21

I'm not sure why it doesn't work for you - I'm sure I've used it before.

Quickie solution is to use Console.Beep

Console.Beep(440, 1000);

[Edit]I've just tried your code and it works perfectly, although I would use standard musical frequencies[^]. Person's with a sensitive musical disposition such as those with perfect or good relative pitch could find 500Hz/1KHz quite painful![/Edit]

Re: Beep() does not work

PIEBALDconsult15-Jul-09 18:20

PIEBALDconsult

15-Jul-09 18:20

DaveyM69 wrote:
quite painful!

Ehhhhxcellent...

Re: Beep() does not work

Rajesh R Subramanian14-Jul-09 23:55

Rajesh R Subramanian

14-Jul-09 23:55

gehbitte wrote:
public static void Alarm()
{
for (int i = 0; i < 3; i++)
{
Beep(500, 1000);
Beep(1000, 1000);
}
}

You are not bothering to check the return value from the API. Can you check it to verify that the function succeeds?

It is a crappy thing, but it's life -^ Carlo Pallini

Re: Beep() does not work

Luc Pattyn15-Jul-09 0:37

Luc Pattyn

15-Jul-09 0:37

Hi,

long time ago I started using this P/Invoke code:

/// <summary>
/// MessageBeep.
/// </summary>
/// <param name="type">Beep type:
/// 0x10 = "x" = HAND, ERROR, STOP = sound "Critical Stop"
/// 0x20 = "?" = QUESTION = sound "Question"
/// 0x30 = "!" = EXCLAMATION, WARNING = sound "Exclamation"
/// 0x40 = "i" = ASTERISK, INFORMATION = sound "Asterisk"
/// </param>
/// <returns></returns>
[DllImport("user32.dll")]
public static extern bool MessageBeep(int type);

Not sure I still have to do it this way though.
BTW: Make sure through Control Panel Sounds the right sounds are installed.

Smile | :)

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